The Zytek ZJ458 engine is a 4.5-litre, normally-aspirated, V8 racing engine, developed and produced by Zytek for sports car racing. The ZJ458's rev-limit was about 10,000 rpm, and produces its power output of 635–700 hp (474–522 kW) at 9,000 rpm, and peak torque of 590 N⋅m (435 lb⋅ft) @ 7,500 rpm.